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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d764af90b580e7a3e9c86fc91bd25a5e11840e55aafafa41959a452a9c1a10c' 
  AND token = 'Do/znB2xSdrTmxtnHdA9f193VRMu4N7NPE0I+DseGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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