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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7034f156cce9dfa253580e32862b1a33af0902114793f90007c8a3329206b0cd' 
  AND token = '1+N+AXrEfBMlVe3FOa+0ThYApiFJi7mpg+0igGaTFhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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