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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7c4508b27cd848106741cadb5a3131e7e66362fc7920f7d35fd6f84e01c56e' 
  AND token = 'wXF49QsPxhUp/lyp2UraW+A+z7Qmm5dIdxyM84SffsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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