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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44eb3835d88a3ade6cb6c188501874268f66b281923daa28efece9d38f4e475' 
  AND token = '5al7+T2upn5wCk4B9aoBtvNsoMgR9ju644R+bHppTKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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