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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3452fbcc95fd200a5dd4668f8c8f048cc6f1a614660c06819acc53586a6562' 
  AND token = 'HqeJosq66E07OjFIowLayR2MB9n7Bn6RZCeBTXE1fmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}