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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974347cd9bb963dda19d4ac0b3889512ec9fb5f3102fda5368c05b611549c72d' 
  AND token = 'cZTIssSTn8lGZRm7cHAulmWUqStUo9XKrxt6E3rogDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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