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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fa14d804ad0fa857ec64f55bacd94cf6c1d18b9fd4c6471d53828d75b8c8ac' 
  AND token = 'd9FHPdIGMJ3vc76YEFuSF9VUTAJwMWgC73Ldj4/KJ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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