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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3a5c10a6e1209a2de1b9e7fcb3e2587d752fe1a158298f9b474dc47466f51d' 
  AND token = 'UHaTlAON32cvaXIpOgJimrPAssTSsOw7SzrJZSyQxcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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