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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70cd78a8b5b0241a912318d5d9a4edab42d0bb1cf04a56ad492be05080b3344' 
  AND token = '64O/HV4hBI+s45b7Mr5wYZ4EZ5oJuQ4ED4MT4AfSh4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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