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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371526868ef8bd98bb1a61e1dfbe8f72b90ebcf6fc0c08f179cdf9042708a445' 
  AND token = 'IlTg7neHO2E6SeA8Nx/OqoGWKRN9cd/D4jj14xBWy/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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