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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8129d96639aa905781cb44c2ea7772c882999f0ff071ae77b13bbbadd3339da4' 
  AND token = 'd4vWPf9ipL6z3fm0pcRMVOwY+8I4BB21yLFnXWsf22Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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