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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9e048de3bae4f39c553ba3ef74da71e8494e6a8dc219555f3ad361c351d462' 
  AND token = '6h8ju4LQLW6C2AL5y6Fv1j9s497cgxrOm1dO42S45ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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