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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61d620b90a1a3c7c31beb77a80cea7bc75893ce2bf6026db0a5eed6fd72c7b0' 
  AND token = 'fG3oBAmmWI7ZhtYjOkFrv/FV9RoKw7h+j4RB78xofZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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