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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8ef0c6fa1af40dc86385660f8e99c9254f8b7ac74f089ba0788cb5283a6292' 
  AND token = 'glWAVSN9NvpODpnaiIqYSBkaptyb2ijGzkC4Cy6/k7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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