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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc444d69e1fa9ff41cdb783b8d4f07e3860daa41efebb1e36df32ceb22db3f3a' 
  AND token = 'ayojHYrfy8THN0YSHCDZd1SRb05IVpi33i6W8Dkm9Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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