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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82bf928b4d1387b341db0840453111dacc21fd7fcc68864854d6cf2bca90f88' 
  AND token = 'wN/npYxvdV8YqVwYDdqxRN5kKfAa4m/g6Oi1lRb8ais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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