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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc46843deb5e84d852fb5ab04e3cd752d0887773355a3a8e50fd861e44a5e44' 
  AND token = 'wUrvNb0Ryh6BraLai78NBbGC4cpR6N6Mh4qOwED6wHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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