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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87129b6dc2589c4ab33cf560f8da1635dffedb5bfa9ba55c21e42f7de4e04fb' 
  AND token = 'fv2Fwd/rWRQT0PquCh3HO5x3557vmakEIwoT/bl7w5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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