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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4082365fd8d8658a7b58c1a9f8e7b1379e28ad564f51d87a4a4fc9227f4dda6' 
  AND token = 'e+59lk/iyh0tiGaZ1ilblhPX3v8+gCFkkQpdBWzzL10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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