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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f88534262e73af1f430be607bf56118337e10036aea808ef631a6379f3a6cfa' 
  AND token = 'lftz009Nkaow1jS4q1WbiQNEiIMxA1SaQFaegVaWBfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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