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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325394d3e2192eb1cdc0ae5d789d009893b88010495c799e4530f8921e9b3eca' 
  AND token = '/v/mkb/fmeIdWS0kHriErMyQNe11wI65D00o9EiTYco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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