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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3238f51b9ad8f7a581e2a06f09bf6ac917a113b201edb7d5529347d5a9a5a2' 
  AND token = 's9atvTgmPBlegGEgwkCcmOF57vDVI5hWuvOZuzS4zi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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