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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1eef825b9f29001d22ef59dee90d3fe78648f9c05743fd44443320a9353de1' 
  AND token = '/bvayn9xlTu9IGxIkrYsOKsi3m7ysRkt83k/R7H9kCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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