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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c30ee4903cecb97da79e11130dae83eb840ec428fe3a591f9c903f3e690689f' 
  AND token = 'nhM35i+t163Kh1zbZ7pBaT4kF2tWLgM4eG2beXTYGMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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