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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83dade058fa9338c033e4d7c6be2b348bef6d806469d25c30c9ba2b3d547d6e' 
  AND token = 'TPLcjerP4jYk8NTUYqusOTiWQxI7zg5o/sIFOgb7HIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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