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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2702455556e59bd7cb2fbb9b594b8b0841c449285e1221bdd4049eed1557d941' 
  AND token = '04wrZmC1X81BUAxBVBYJKDCi6h6cIBBOlMX9idbgeoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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