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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd828e3368edc0c8d875caf462025b40bff58bab5b0f14babe58de1f333bc45' 
  AND token = 'aBuxWy6Xaaw4LfvwAGj5kt4f9Dy950BYobhXhyGMRYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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