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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e220e260d08229aed9d213e6262dd82c11a024e1fff0f85bf5fa3cdcef7f4b0f' 
  AND token = 'Q5R+p6G+EtmM9AVi5ZdI1ZdO6Br58jTUIVuuqSEAl7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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