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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e73ceb9adf13a9185bcf740853fa0be59020fe9d58a9d1bf589f556eed1a13' 
  AND token = 'GjXwNhZXY4+epdyWTGowtLmtU78ULnkMpLFx7rkiGQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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