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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5a009b2083ec1e4c9832941badf5a67f934a9519c5fa6d662025795c9c3885' 
  AND token = 'U1hfPiXVW//k89jvpMW1Xt5SBV5jcDUhj9awf2pO5Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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