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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9ac7cabc58c38d6eaea3a4e13967a244493e01cca15c85ac54c4c9df967103' 
  AND token = 'ssImD+uyWkKGwLACFYZ1LORBUPIlnJD0qB8ucKy3e/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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