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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a7f6744708f9dd0053107f9e11aa9bd973852d46ff0f4f13a0a96186038958' 
  AND token = '62CcojBrtwoaKgoePeA7A5o2SaJCGRfl0Pwh7OvyDSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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