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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2597c703bb4ec24d3c00b787dee169f230df2fe12bb92994711271dcbdd2ea2' 
  AND token = 'ekWski4s0hDx7aU6krStYwUPow6I3JAl/o1DnS4h1pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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