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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe6f123df4a6d461ca87d9b62714e3de7bb80410a85eb13e142fda37cab1fb3' 
  AND token = 'MX8TKuXcgMMInhhjozQFueaf7uGOOBGhWMiK+AW2bpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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