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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab3904e25268b213f59f97985e93915e35cb39bd3284256ec1d5dd9b15c264a' 
  AND token = 'BJnTd5Qw980MkJJNkRgzh8c2dzSfNaKmxxhUXci4Ajw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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