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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae206bdfb299a4f826c20b25351f716497136eb6b40a607e74397ecab34c83f6' 
  AND token = '7rhGH/7bxGkkojY4zw+J4pHYyid2PbLAHbzdqrQ3rBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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