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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6b6945c5f75ee8c9db7a7bbaa5b1e10b518bf00c679083522e3f97b872f710' 
  AND token = 'mwatm+29xSdQ9phd+DC2/PeUcK5LQX3WWXNNVIr1ksY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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