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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4090d1f1c2fbbcbcb56b9a0ac4c310cbc2811e23921c23adb8f6b2caae2f4d5b' 
  AND token = '/m92g8S/4BPRN6TCefz7FCnPFL5sKlDNYvcfHIFiaJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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