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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5268c21e933a569ac173b4dfbb54ece981467bbced09acde5137d5532b24c79b' 
  AND token = 'tB1QOfMhaMADBU5kT4iz3r57/0MLqamCUNKFA42f4pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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