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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee0d43620dc97ace5e870e6f56b47938b073834ae744982246643070d2f3168' 
  AND token = 'T7qFZ0Ub2exgS1qSRjrQHog3QPd1HIk+m8F2eaFUNgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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