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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150b30e72fffe6b41aee96a30fd23174a983191f1c790cb251aef5e9988d5cec' 
  AND token = 'GfLPvsSK3FtHAEnepKznKxfyYcZA9b8fr0AhM2IIuq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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