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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d8ea62deac6a6ef8f99faef5c797550edbd4f924a61b439c39ca6b995491a8' 
  AND token = 'PX2H0ktEM3aICj5tFqyszuWVQ0rvnxTW5v/sJDnQbMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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