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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1d0fe5f52352f822d569ba4bf035bc71bd76feead2837d3687f267a69ab879' 
  AND token = '9L3FH6ulncciSho3kmyv2nQMviKkAe5zV2qBxcOIw9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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