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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a7a8169098afdfdb7f1fb77e738259872cbaaee45fcc629d209734df526455' 
  AND token = '3mKej4vAWo+3egf1Gc1br2Pbq7OfSaezpLLCGZDMa1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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