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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b510036889e68e29f0220d4bbda1728ed7f0a632324c3e7336eb9fa5bc37171' 
  AND token = 'gqjjfottaFHz8bG9EXevxCDaCy/8jlo6TpOk0LUFmFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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