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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79006b084f4d4c08963b401da734ad85e5efa78befb5e80c9f77fae9ed5b1e25' 
  AND token = '4cGThGU0wCNod2ujGwwPR9Oy0d5q72iH2itK9i5Hmm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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