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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6156770250fb9c41d2af87a1b04d67dd8d53cac6c85107c2c5797abb2faadda4' 
  AND token = 'NyHssenPDs7A1D4qPAXsRTODiWNM5KN5bzsd1ao0qzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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