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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62099b646ff17e0b1bb82a190f22a09236ad5ac8c89c1374b0d97bbcc1236a25' 
  AND token = '+rutVAaifTidjSdJScDMHh1YE4vxZTvd0RG7AqkHCvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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