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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759d7d6439b3d8be575e6411a6b82ca83be8e47c0f4d3ab6d7f0668f2d55fab1' 
  AND token = 'cCZ0APcQ23iLDvf8epSkatdFJRSu73N4Qdzl2eCL6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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