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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dc4d6735978faa0ec1a97648419c7457bd7f4eb6a71d0109ef6216cdba0c4f' 
  AND token = 'CQiuRjvCB6Ij4rOP1VtSahc4QUy2MF/55l8U7wL5/u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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