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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd82b78f2dd0ddda8c6a22648978aab60987ce1fc999666f6daac6f582575273' 
  AND token = 'k07DzK10zcz2Y+KpMk+CyiolyoUbPVjGCEEW7G6LN4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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