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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064b3d11e5e101d0448868806744a03b03e1d960f7666f350ba87d21bafd2263' 
  AND token = 'n5H6o5bLb2NYDRizCFq5nJfoFkkiUvPC6o1wLUAQ794=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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