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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35924a7150a70107d067bf4a4f0288863c5392fa142a71b3d28a27b7f899a85' 
  AND token = 'VJUVp2OJ7iD2/SVH5+pt3e48LyBjRlnWb02nysEJ3bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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