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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6da73d97db9f013acc7518dc1a8ef613f5f648af973620d93f0e8526aa8229' 
  AND token = 'xC3tjkFFKHpLadTI3KY/nHObQ0G3CacMrwd6yheEwMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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