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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2f5934dc512611cb12943c8828a9383d56fa68ad1d675809f3eb46c4349b10' 
  AND token = 'Ek4l7A2kMib9DzOGryDa796+rImuM65cewmqoh0HEA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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