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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca7560fe64b499c70ccd792e73cdc0c6a75de4d92bbeab5854e06940fb9f926' 
  AND token = '77qKHtFbAhtxsSDba9e/02RQW+DAgksNItsRHIYng44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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