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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82a4eab29b785bd8200e7f17e4a98c6e82e442303308dd232fa712766359626' 
  AND token = 'SzR2TwtzfQd0rrJ1QWMsdbsE4K8rR1DyN5zp27TI4uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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