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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942df18448efa4e0bdeffa9056076494d2a6384c664aebcb71751e557185a786' 
  AND token = 'rPVCrNng+x/rTn+k7rnfU3xtIjHa3TR+xne9n0TS5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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